US1571999A - Toothbrush - Google Patents

Description

Feb. 9, 1926;

' 1,571,999 I... M. DAVIS TOOTHBRUSH F'iled Nov. 29, 1924 l NVE N TOR LZMMEL Patented Feb. 9, 1926.

UNITED STATES PATENT OFFICE.

' ,IJE UEL MORGAN DAVIS, or LONDON, ENGLAND.

TOOTHBRUSH.

Application filed Itovember 29, 1924; Serial No. 752,851.

To all whom it mag comm nt Be it known thatI, LEMUEL MORGAN DAVIS, a citizen of the United States of America, of 10 Prima Road, Stockwell, London, S. W. 9, England, have invented certain new and useful Improvements in Toothbrushes, of which the following is a specification. V

This invention relates to. tooth-brushes,

and has for its primary object to enable the brush head to. be removed from the handle" portion at will, and changed or renewed as may be desired.

For. this purpose, according to the invention, the stock'portionof the brush, 1. e. that portion in which the brush head is fixed, is

made detachable from -.the handle-portion and fits slidably in a channelled socket or trough forming a virtual continuation of.

the-length ofthe handle; the stock, which j adapted tobe slid into position against a stop by a movement lengthwise: of the socket, being retained therein by a locking device capable of disengagement at will.

One form of theinvention isillustrated in the accompanyingdrawings, whereinFigure 1, is-a side elevation, partly in section, of the front portion ofthe brush with the brush-head (which carries 'the' bristles)- of the handle being shewn, and the remainlocked in position, only theadjacent part ing part being broken off for the sake of convenience. Figure 2 is a similar view, the brush-head being shewn as partly withdrawn from, or partly inserted in, position. Figure 3'is a face view of the brush-head and bristles. Figure L is a cross section on the line 1t of Figure 1. Figure 5 is a side elevation, partly in section, of the locking device, drawn to a larger scale, and Figure 6 is a top plan view ofthe same.

Referring to the drawings, the handle 11 of the tooth-brush is provided with a forward continuation in the form of a laterallyflanged, fiat-bottomed trough 12 of thin material; the flange 13 at each side of the trough being carried round the forward end of the trough as at 14 so as to constitute a stop for determining the position of the brush-head 15. Each lateral flange 13 is. inwardly re-curved (see Figure 4) to fit over the correspondingly rounded lateral edge 16 of the brush-head 15; the end flange 14: being similarly recurved to. fit over the rounded front terminal edge 17 of the head; whilst the head itself has a flatback adapted surface of the brusliliead 15.

to slide over and lit snugly against the bot tom of the trough 12. In order to ensure both a tight fit and also easy retraction of the head 15', the lateral edges 16, 16 of the {head preferably converge slightly, in the forward direction, as shewn in Figure 3.

The locking device for retaining the brushhead 15 in position is preferably constituted by a stud 18 (Figures 5 and 6)' which passes through, and is adapted both to turn and to slide in, a hole in the handle 11 (or in the bottom of the trough) immediately beyond the rear end of the head; this stud having at its outer end a thin or flatly-domed head 19 adapted to contact with the back of the trough or handle without proyecting appreciably from the surface thereof, and at its inner end a radial and slightly elastic 11111 201adapted to overlie the adjacent end of the brush-head and formed with a hooked or nibbedv extremity 21 adapted to snap into engagement with a notch or depression 22 on the upper or front \Vhen the brusli-head is to be with-drawn from its position, the stud 18 isturned so as to free the hooked. or nibbed extremity 21 of the arm 20 from the notch 22, and is then pushed or allowed to drop. through the hole until the arm 20 lies in a recess 23 provided for the purpose in the surface of the handle 11; whereupon the brush-head 15 can be freely slid out of the trough 12, with the bottom of which the upper surface of the radial arm 20 then lies flush (see Figure 2). The notch 22 may have a leading-in groove (not shewn) to facilitate the engagement and disengagement of the hook or nib 21 from the notch. In order to economize space, the

stud may be received in a half-round notch 24c at the adjacent end o'fthe' brush-head15.

whereof the conjoint span is greater than the diameter of the upper end of the hole;

In order to avoid risk of an edge of the head 19 of the stud, when in its normal or looking position (Figure 1), projecting 11evond 1111 rear 51112 111 1 1 111 the handle 11 11nd trough 1.2 in 511111 1111111111 :15 to permit of the 11111111 1!) catching against the iipe or gums of 1111 user, the head it) is preterahly received, as shown, in 11 1'11151; 213 (Figure 5 3) formed on the back of the handle by 11 rounded 111111111111 1 1111111111 2? which pro jeets 11"111111 said back as indicated. Moreover, in order to 1111i1i1 111'11 the thorough washingout 111' the 1111111215 in which the stud 18 is 111111111111 1 reeeived. that portion 29 of the shank which seats: itself in the 111111 is 111111111 111' 11111111 1 diameter than the portion to which 1111111111121) i11i111111edi11te1 1 1 11111 111 11. no 111111, when the stud retracted 11s in Figure 2. 1111 1111111 "3% is left open tinfougin out virtualiy its entire extent; whilst, in order to guide 11115 portion 251 111' 111rger diameter into its 11111111111 position in the hoe, the 511111111111 1 between the portions 111? the stud having diii erent diameters 1111 111111111 11111111 11101 tapering as indieated 111: #111.

it W111 111 ohvions that separate hrnsh 11 11115. 1enpee1ive1v 111rr vi11; various dil 't'erent kinds of hristies (or equivaient 1 1elnents. 11111-11 for example as 11111111 1- protuhernnees), 31111 1 1' 1111 111191 of the 1111 1 1 111 invention 111 interehangeabiv used with the same 11111111111; 11 point 111 eonsidernide eon 11 1111 111 11 11nd 1111 011111111.111 in certain dental 1 11111 5. 11s 11.11 111111111111 where. owing to 11 septie eondition 111 the 1111111111, 11 is desirable to 1 111111111 brush heads termed together with the 11rist1es or equivalent elements of eueh inexpeiisire 1111111 11111 1111 to justity 1111 entire 111111111-111 1111 111 11151 thrown away 1 111 11 111111 the i111p1e111en1 need.

'1. A 1:o1'1th-1 11u.- ;11 comprising- :11)1111-.il-11131'111, 11 11111111111 5 .1111111111111 1 there'11o111 111111 provided 111' one end with 1111111111111 side 111111 1 1111 111115 1111111111 11 .uoeket adapted to 1 1111111111 re- 11 111 the 111111111-111 1111, said 11111111111 111 1111 pro vided with 11 pertoration adjacent the 1 11 11 111111 111 11111 5111 111 1. 111111 11. 1111111 in said per i'oration. 5111111 11111 11 11'1l1111l1sillj3: 11 stud 1111111111111 1111111 111 turn and to slide in the peritoratioin 11 11- 1111 on the rear end 111? S11111 1111111 1111111111111 to engage the 11111111111 from the rear, and a. spring-11rn1 projecting 1111111111,

1111111 the trout end 111? the stud and adapted spring-111111 projects radially, said part of F1 11111 1 diameter extending beyond the pertor111ion in the 11111111111 when the 11111111 is in locking position.

3. 1'1 tooth-brush comprising 11 hrush- 111 1111 11 11111111111 separable tllere'i'roin and pro vided 111'. one end with intunned side 111111 end 1'111111 torniing 11 socket adapted to 151111111113 receive the brush-head. said handle being provided with 11, perforation adjacent the 1 11111111111 1111 the socket, and 11 latch in 011.111 perforation. said 1111011 comprising 11 stud adapted 1111111 to turn and to 5111111 in the perforation, 11 11111111 on the r1111 end of said stud adapted to engage the handte 1"10111 the renr 111111 11 11111i11;r11rn1 projeeting 1 1111111113 From the front end 111 the stud and adapted to engage 11 depression 1111 the front 11111'111111 111 the hrush head the stud comprising in i1 1 11 1111111 two parts 1:1:1 difi'erent diameter, 1111111111 11 part of iareer 11111111111111 next to 1111 111 1111 111 the stud 1111111111111 111 1111 the per- 111111111111 in the 1111111111 and 11 part 01 5111111101 di11111e1er from which the Spring 111-111 projeets radially. 111111 11. tapering portion uniting the two parts of dilierent dialneter, said part 111 1111 1111111.- 111111111111 1 extending 1111 101111 the perforation in the handle when the 1111'111 is in looking position.

1-. A: tooti1-11rus11 11s e111i11ie11i11 111111111 3, wherein the 111111111 spring-111111 torined with 111101111 extensions adapted to prevent eonipiete retrartioii 01 [1111 1.111111 from 11111 per oration 111 the handle.

51. A, t1i111th-11r11s11 11s 111111111111 in 111111111 1,, wherein the brush-head 11111: its 1111111111 edges 1111 111111 111111'11rge11tin the ilforward. direction, and the inturned 511111 w1111s 111 the 11111 111 11 on the 11111111111 are eorrespondi11111 1 convergent to it said lateral edges, s1111- 11111111111111 as described.

111 111117 11111 Mt KHAN 11111 1 S.

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